Enhancing the tribological and corrosion properties of 2A12 aluminum alloy via micro-arc oxidation and paraffin sealing

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-02-20 DOI:10.1016/j.colsurfa.2025.136476

Zhiyuan Guo , Jingfu Song , Guoqing Wang , Gai Zhao

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Abstract

The 2A12 aluminum alloy is widely utilized in aerospace, automotive, and marine engineering due to its excellent strength-to-weight ratio and good machinability. However, its wear and corrosion resistance under harsh conditions are insufficient and require improvement. This study combined micro-arc oxidation (MAO) with paraffin sealing to enhance the corrosion resistance and tribological properties of 2A12 Aluminum Alloy. The results indicate that the MAO process significantly increases hardness and tribological properties, but the porosity into the oxidation layer may accelerate corrosion in corrosion environments. Paraffin sealing effectively fills these pores, reducing the penetration of corrosive agents and significantly improving corrosion resistance. Additionally, friction tests show that the hybrid coating after paraffin sealing exhibit a lower friction coefficient and wear rates. Molecular dynamics simulations (MD) further reveal the distribution of paraffin within the pores and its effect on wear and corrosion resistance. This study demonstrates that MAO combined with paraffin sealing is an effective approach to enhancing the corrosion and tribological properties of 2A12 aluminum alloy, providing new insights for its applications.

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通过微弧氧化和石蜡密封提高2A12铝合金的摩擦学和腐蚀性能

2A12铝合金由于其优异的强度重量比和良好的可加工性，在航空航天、汽车和船舶工程中得到广泛应用。然而，其在恶劣条件下的耐磨性和耐腐蚀性不足，需要改进。本研究将微弧氧化（MAO）与石蜡密封相结合，以提高2A12铝合金的耐蚀性和摩擦学性能。结果表明，MAO处理显著提高了合金的硬度和摩擦学性能，但氧化层的孔隙可能会加速腐蚀环境中的腐蚀。石蜡密封有效地填充了这些孔隙，减少了腐蚀剂的渗透，显著提高了耐腐蚀性。摩擦试验表明，石蜡密封后的杂化涂层具有较低的摩擦系数和磨损率。分子动力学模拟（MD）进一步揭示了石蜡在孔隙中的分布及其对耐磨性和耐腐蚀性的影响。本研究表明，MAO结合石蜡密封是提高2A12铝合金腐蚀和摩擦学性能的有效途径，为其应用提供了新的见解。

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阿拉丁

N-Eicosane

阿拉丁

Sodium hydroxide

阿拉丁

Sodium metasilicate nonahydrate

阿拉丁

Sodium hexametaphosphate

来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.